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The PS-400 is one of a family of two keyboards introduced in around
1982. It is very similar to its PS-300 sibling, and sounds the same,
but adds a couple of extra voices and some additional features. My
PS-400 is black in colour, while my PS-300 is beige; I do not know if
any colour variations were available for these models. Both models came
with a colour-matched plastic carrying case.
As well as all the features found on the PS-300, the PS-400 has a
Transposer, a Chord Sequence memory, and a Duet function, which
automatically harmonises each note played according to the selected
chord key. Interestingly, when the Duet function is enabled, the
keyboard retains two-note polyphony. Even the much later and much more
when its Duet function is enabled.
The PS-400 also has an auto arpeggio feature, which adds a rippling
effect to the auto accompaniment, similar to the PC-100
and a "4-bar Variation" button, which invokes an automatic rhythm
percussion variation every fourth bar.
Rhythm, Chord and Arpeggio volumes are all independently adjustable
using what feel like analogue sliders, but the levels are actually stepped.
As typical for Yamaha keyboards, the small built-in speaker sounds
remarkably good, but there are both Aux out and Headphone sockets
should you wish to use external amplification.
This is a very nice sounding keyboard. Its voices are virtually
identical to the PS-300 and the later PS-200
and very close to the PC-100
Sorry, there are no audio samples of the PS-400 yet.
The Operating Manual for the PS-400 can be downloaded from the Yamaha Manual Library